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Automatic Bidirectional Visitor Counter

Decent Essays

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Automatic Bidirectional Visitor Counter
Project Report

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Automatic Bidirectional Visitor Counter
Project Report

Table of Contents
Executive Summary2
Introduction2
Working2
Components Used3
89C513
Light emitting diodes (LEDs) 4 Infrared Sensors 4 Seven Segment Display 6 Transistors 7
Circuitry7
Applications8
Future Development8
Conclusion8

1. Executive Summary
The objective of the project was to create a circuit with an 8051 microcontroller that senses when an object passed through an infrared receiver’s receive path to automatically turn on lights and count how many times the receive path was …show more content…

The project needed a circuit to pulse an infrared LED at 38 kHz, a circuit to receive the infrared signal, a seven segment LED display circuit, an auto-lighting circuit, and a programming circuit. The project also required code to be written to the 8051 microcontroller to combine all the smaller circuits into an operational system.
The 38 kHz generator, was major factor in getting the infrared receiver to operate correctly. A 555 timing chip was used to output a square wave at 38 kHz for an infrared LED. The generator needed to be completely isolated from the rest of the circuit because it was found that the infrared receiver’s output was similar to at a frequency of 38 kHz. The receiver needed to output a high until an object blocked the infrared signal when it would output a low.

* Seven Segment Display
One common requirement for many different digital devices is a visual numeric display. We've all seen seven-segment displays in a wide range of applications. Clocks, watches, digital instruments, and many household appliances already have such displays. A seven segment display is the most basic electronic display device that can display digits from 0-9. They find wide application in devices that display numeric information like digital clocks, radio, microwave ovens, electronic meters etc. The most common configuration has an array of eight LEDs arranged in a special pattern to display these digits.
They are laid out as a squared-off

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